[Q] Please Help, - XPERIA X10 Q&A, Help & Troubleshooting

I just finished flashing my At&t Xperia X10a over to 2.1 and I must say it does move a lot quicker now.
Big problem, however, is that I cannot get it to re connect to the network. When I boot up the phone it will tell me to choose the language. When I select English(United States) it then pops up with "Please insert SIM card and restart your phone."
I can hit Cancel and get into the phone and still use everything. Wifi works and all the apps are working no problemo. I just cannot connect to the cellular network at all.
Steps I've taken so far are to go into the settings to Mobile Networks and go to network operators. When you enter, it Searches for mobile networks and locates At&t (and while i'm writing this, for the first time T-Mobile as well -not important). When I Select At&t it says "Registering on At&t" then it fails saying "Your SIM card does not allow a connection to this network."
I know the SIM card works cause I have another phone that i've put it into without any issue. Conversely I've taken my iPhone 3gs SIM and put it into the Xperia just to try to get it to connect and its the same story with the SIM card does not allow a connection to this network.

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Have you checked to see if your apn settings are keyed in? If not got to settings/wireless and networks/mobile networks/access point names if theres nothing in there you will need to manually enter your settings for the network. The settings can be found easily by searching at&t apn settings. If your phone cant see your sim though thats a whole nother issue and it might just ne nest to try amd reflash.
Sent from my X10i using XDA App

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Like Cmoney said.. reflash is probably the best and only solution here. Factory reset with SEUS will most likely do the trick

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When i flashed from 1.6 to 2.1 i had to manually enter apn settings. Im also on ATT so here are the settings.
First go to settings/wireless and networks/mobile networks/access point names (not network operators) then click the menu button and tap "add apn" then use these settings:
Name: ATT
APN: wap.cingular
Proxy: none
Port: none
Username: [email protected]
Password: none
Server: none
MMSC: http://mmsc.cingular.com
MMS Proxy: wireless.cingular.com
MMS Port: 80
MNC: 410
Authentication Type: none
APN Type: default,supl,mms
Just skip the lines that say none and some of those set themselves.
To avoid this in the future use an app called "APN Backup and Restore" to make a backup of your settings before you flash new FWs.
Sent from my X10i using XDA App

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Hi,
i have added apn setting, but no use i think these setting for internet use,,
i have still "no service" message comming,,
I go to the mobile shop,,, they say it is a hardware issue,, idont know what to do,,,
or how can i restore my orignal rom,,, please explane step by step,, i am new to andriod
how to use SEUS
thank you

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ubaidlodhi said:
Hi,
i have added apn setting, but no use i think these setting for internet use,,
i have still "no service" message comming,,
I go to the mobile shop,,, they say it is a hardware issue,, idont know what to do,,,
or how can i restore my orignal rom,,, please explane step by step,, i am new to andriod
how to use SEUS
thank you
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=928343
use this.. flash the X10i_2_0_2_A_0_24_GLOBAL ROM using Flashtool (just search the forum a bit) (or x10a, if you got an x10a.. to check, remove your battery, it should be on the label attached to your phone)
If that doesnt work, download Pc Companion from
http://www.sonyericsson.com/cws/support/softwaredownloads/detailed/pccompanion/1.689743/xperiax10?cc=gb&lc=en
here
Connect your phone, and do a factory reset (or what ever its called )